A measurement of the vector to pseudoscalar conversion decay ϕ→π0e+e− with the KLOE experiment is presented. A sample of ∼9500 signal events was selected from a data set of 1.7 fb−1 of e+e-collisions at View the MathML sources∼mϕ collected at the DAΦNE e+ e− collider. These events were used to perform the first measurement of the transition form factor |Fϕπ0(q2)| and a new measurement of the branching ratio of the decay: View the MathML sourceBR(ϕ→π0e+e−)=(1.35±0.05−0.10+0.05)×10−5. The result improves significantly on previous measurements and is in agreement with theoretical predictions.
Measurement of the φ→π0e+e- transition form factor with the KLOE detector
ANASTASI, ANTONIOPrimo
;MANDAGLIO, GIUSEPPEInvestigation
;
2016-01-01
Abstract
A measurement of the vector to pseudoscalar conversion decay ϕ→π0e+e− with the KLOE experiment is presented. A sample of ∼9500 signal events was selected from a data set of 1.7 fb−1 of e+e-collisions at View the MathML sources∼mϕ collected at the DAΦNE e+ e− collider. These events were used to perform the first measurement of the transition form factor |Fϕπ0(q2)| and a new measurement of the branching ratio of the decay: View the MathML sourceBR(ϕ→π0e+e−)=(1.35±0.05−0.10+0.05)×10−5. The result improves significantly on previous measurements and is in agreement with theoretical predictions.File in questo prodotto:
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Descrizione: phi in pi0e+e- transition form factor
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